725309789 has 2 divisors, whose sum is σ = 725309790. Its totient is φ = 725309788.

The previous prime is 725309747. The next prime is 725309797. The reversal of 725309789 is 987903527.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 362712025 + 362597764 = 19045^2 + 19042^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-725309789 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (725309489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362654894 + 362654895.

It is an arithmetic number, because the mean of its divisors is an integer number (362654895).

Almost surely, 2^725309789 is an apocalyptic number.

It is an amenable number.

725309789 is a deficient number, since it is larger than the sum of its proper divisors (1).

725309789 is an equidigital number, since it uses as much as digits as its factorization.

725309789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 952560, while the sum is 50.

The square root of 725309789 is about 26931.5760585971. The cubic root of 725309789 is about 898.4788250173.

The spelling of 725309789 in words is "seven hundred twenty-five million, three hundred nine thousand, seven hundred eighty-nine".